Metal-punch.



W. G. ROBINSON.

METAL PUNCH.

4 APPLICATION FILED MAY 29' 1909.

939,324 I Y I Patented Nov. 9, 1909.

WILLIAM G. ROBINSON, OF PITTSBURG, PENNSYLVANIA.

METAL-PUNCH.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application filed May 29, 1909. Serial No. 499,227.

To all whom it may concern:

Be it known that I, WILLIAM C. RoBINsoN, residing at Pittsburg, in thecounty of Allegheny and State of Pennsylvania,a citizen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Metal-Punches, of which improvements the following is aspecification.

In attaching metal strips, plates, etc., to a supporting structure bynails or screws, it is frequently desirable that a counter sink shouldbe provided for the head of the screw or nail. Unless the nails orscrews'are so spaced as to render it possible to do the work in a shop,it is necessary for the workman to have not only a drill for making theholes but also a tool for making the counter sink, and these tools mustbe changed from the operating handle back and forth for every hole.

The object of the invention described herein is to provide a punchingdevice so constructed that the hole and counter sink may be formed byone movement of the tool, which can be operated by a blow of the hammer.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification isshown a sectional elevation of my improved punching device showing astrip in position to be operated on.

My improved tool consists of a heavy base 1 adapted to be secured byscrews or bolts on any suitable foundation. This base is provided withupwardly projecting standard 2 provided at or near its upper end with anoverhanging projection 3 having an opening therethrough adapting thesame to act as a guide socket for the punching tool 4. This toolconsists of a steel rod of a uniform diameter, except at its lower end,where it is reduced to form a punch 5. The

' displacement o shoulder 6 resulting from the reduction of the end ofthe rod in forming the punch portion 5, is beveled or inclined as shown,such inclination extending from the punch outward and upward. In thebase plate 1 is formed an opening 7 slightly larger than the punch forthe reception of the latter, and the walls of this opening at the upperend thereof are given a bevel or inclination as shown at 8 similar tothat of the bevel of the shoulder 6. The rod is normally held in raisedposition by means of a spring 9 interposed between the upper end of theguide socket and a projection on the rod which may be formed bytransverse pin 10.

In using this tool the metal strip, such for example as the case pieceof a metal molding is placed on the supporting block with the pointwhere the hole is to be formed in line with the punch and the hole inthe block. The operator strikes the upper end of the rod a blow forcingthe punch through the strip and also forcing the beveled shoulder downso as to produce a bevel or counter sink at the edges of the hole in thestrip. The bevel at the upper end of the hole in the sup orting blockpermits of the f the metal necessary to the formation of thecounter-sink in the strip.

I claim herein as my invention:

A hand operative punching tool having in combination a bar having oneend reduced to form a perforating point and having a beveled or inclinedshoulder at the base of said point and an anvil block having an openingtherein for the reception of the point the end wall of the opening beingbeveled or outwardly inclined.

In testimony whereof, I have hereunto set my hand.

WILLIAM C. ROBINSON. Witnesses:

FRIEDA E. WOLFE, CHARLES BARNETT.

